you mean he specifically blocked 6346 because your company has a 'no gnutella' policy?

your admin probably blocked more than just 6346 since gnutella apps can use random ports. in that case, you can't do much, except say please please please to your admin, or use limewire at home.

if your admin just blocked 6346 (although that would suggest your admin is not very clever), then, any other port seems ok, except for the obvious ones used by other protocols (7,21,23,25,53,79,80,110,119,161,162).